19.0121

• 68k: fix buggy move.l
• 68k: move.l with a pre-decremented address register writes lsw and then msw
• app: fix close
• dma: fix 68kToVram
• emu: work on 68k and z80 timings
• emu: quick save states
• emu: initial savestate support
• emu: add ability to pause the emulation
• fifo: work in progress
• fm: busy flag and refactor
• pad: support for 6 buttons - disabled for now
• region: default to US
• ui: add pause and reset
• vdp: fix mid-frame cram updates
• vdp: fix headless mode
• vdp: fix rendering when sprites are close to the top/bottom
• vdp: vb on when !display
• vdp: dma bandwidth, consider REFRESH slots
• vdp: use slot granularity
• vdp: 8bit vram read
• vdp: hint fixes and tests
• z80: propagate un/reset to FM